The performance of the guitar strings will decreased over the time and frequency of usage. The outcome is the sound become fuzzy and not clear. It will no longer sounds as bright as first time when it is still new.
The strings should be replaced periodically, or when you found the degradation of the sound. Of course, the better quality usually can holds longer period, in expense of the cost. That is why there are quite number of grades of guitar strings, which you can tell by their price.
You should replace your guitar strings, or else no matter how hard you strummed it or plucked it, you can’t hear a good sound. Instead, you’ll just hear some unpleasant hitting beats. It happens to me when I attempted some recordings on the guitar strumming, and the result was, it sounds like noises and no clarity of the guitar strings vibrations.
Budgets for Guitar strings…
Well, I’ll say it’s all depends on your needs. If you think you are regularly playing guitar on performance or recording, you should just go for the expensive one.
Not so expensive
If you are tight to the budget, then just go for the medium range.
As for the low range, or cheap one. Mainly just for beginnner or newbie to guitar, as the string will not last long for a long term performance. Also, poor quality string encourage the guitar newbie to practice replace guitar string on their own more frequently, good idea? 😛